They also need to address the issue that if someonee drops in a TG their civ is dead and makes it so much harder for the team to go on, even if there are cases of smaller teams still winning
Share Res, share control, increase pop, so many different solutions
Anything to incentivize staying in the game
The bans currently are fine, just make it so you can’t get your steam sharing accounts on the ladder.
100% this. More map bans is the only logical solution.
Alternatively, all maps should be split into 3 categories: Open land maps, closed land maps and hybrid / water / other maps. Then you just select 
only the map types you want to play. Way simpler; you wouldn’t ever need to change your map type choice, because the map categories would always stay the same but you’d still get map diversity because the pool of maps within them would change with each map rotation. They could also add more maps in each rotation, say 4 maps in each of the 3 categories for a total of 12 maps. Or even up to 6 maps in each for a total of 18. Having only 3 possible choices should make matchmaking much easier too.
4 map bans instead of 1, when solo queuing 3v3/4v4 would reduce the quiting significantly.
You need more splits than that I think. For example, Arena and Black Forest might both come under closed land maps, but they are very different in playstyle. It’s a decent idea though.